Abstract
A technique for the measurement of time-spatial characteristics of heat transfer to air has been developed using infrared thermograph. In this work, a thin platinum leaf of 0.15μm thick was employed as the test surface in order to improve the frequency response. Heat conduction analysis was performed to predict both the frequency response and the space resolution. The applicability of the platinum leaf was demonstrated by measuring the unsteady heat transfer on the wall of a turbulent boundary layer. The unsteady behavior caused by the streak structure formed in the near-wall region was clearly visualized.
